Perhaps making it easier for everyone, I took pictures of the screen I'm referring to.
In picture 1, you can see that there's space between the paragraphs. I put that into the metadata in the Calibre "Edit metadata" window by executing a CR in the description text field between each paragraph which causes Calibre to insert a <p> tag with no content other than a space in each such case.
Picture 2 shows the way it renders when each paragraph (defined by what's between <p> tags) is not separated by that extra CR/empty <p>.
I want it to look like picture 1 without having to edit the html of the metadata to achieve that. I don't mind doing the edits, but that causes excess vertical spacing in the Nickel reader because the latter provides spacing between paragraphs to begin with.
I can provide samples of anything else that you might like to see with regard to this, too.